How Much Will I Grow After 14? What Boys Can Expect

Most boys still have meaningful growth ahead of them at 14, but how much depends almost entirely on where they are in puberty. The total height gained during the pubertal years averages about 30 to 31 cm (roughly 12 inches), and in boys, peak growth speed hits around age 13.5 on average. That means a 14-year-old boy who started puberty on schedule is likely past the fastest phase but still has several centimeters to gain, while a late bloomer may not yet have hit his peak. The range of “normal” is wide enough that two boys the same age can be on very different trajectories and both end up perfectly healthy.

Where the Growth Spurt Fits at 14

Boys tend to begin their pubertal growth acceleration around age 11, and the fastest rate of height gain, called peak height velocity, arrives at a mean age of about 13.5 years. By 14, the average boy is on the downslope of that peak, growing more slowly than he was six months to a year earlier but still adding height at a noticeable pace. The pubertal contribution to adult stature accounts for roughly 17 to 18 percent of a boy’s final height.¹ In practical terms, that means a boy destined to be 178 cm tall will gain about 30 to 31 cm over the full course of puberty. A decent share of that total arrives after 14.

Growth doesn’t happen uniformly across the body, though. The legs tend to grow fastest first, with peak leg growth arriving about six months before peak spinal growth. By around skeletal age 14 in boys, peak leg growth velocity has already passed, and the spine takes over as the main contributor. In fact, only about 45 percent of the height gained during puberty comes from leg growth, because the legs finish earlier and the trunk keeps going longer.² This is why some 14-year-olds notice their pants stop getting shorter before their shirts do.

What Controls When Growth Stops

Height gain depends on growth plates, the cartilage zones near the ends of long bones where new bone is laid down. These plates contain cells that multiply, stack up, mature, and eventually get replaced by solid bone. The whole process is driven by a mix of growth hormone, insulin-like growth factor 1 (IGF-1), and sex hormones.³ Testosterone is often assumed to be the hormone that makes boys grow tall, and it does play a role by boosting growth hormone secretion. But here’s the part that surprises people: estrogen, which boys also produce in smaller amounts, is what ultimately shuts the process down. Estrogen speeds up the aging of growth plate cells, gradually using up their ability to divide. Once those cells are exhausted, the plates fuse into solid bone and no further lengthening is possible.⁴

In boys, this fusion happens later than in girls. An MRI study of growth plate closure found that at least half of boys had fused their growth plates between ages 15 and 18, and 90 percent had closed them between 17 and 20. All males in the study had closed growth plates at all sites by age 21.⁵ By comparison, all females had closed by age 19. So a 14-year-old boy’s growth plates are almost certainly still open, and he has years of potential growth remaining, even if most of the rapid phase has passed.

The Hormone Engine Behind the Spurt

During puberty, testosterone and IGF-1 levels climb steeply. The timing of peak IGF-1 is closely tied to peak height velocity; in boys, the correlation between the two is very strong.⁶ Testosterone stimulates the body to produce larger bursts of growth hormone and higher IGF-1 concentrations, which is part of why boys tend to grow more during puberty than girls do.⁷ But those hormones also trigger estrogen production, and estrogen is what eventually brings the whole process to a halt. The timing of that hormonal sequence is the single biggest factor in how much growth a boy has left at any given age.

Early Bloomers vs. Late Bloomers

This is where things get complicated. Two 14-year-old boys can be at completely different stages of development and still fall within the normal range. A boy who entered puberty at 10 may already be near his adult height at 14. A boy who didn’t start until 13 or 14 might grow well into his late teens. What matters isn’t calendar age; it’s how far along puberty has progressed.

There’s a widespread assumption that late bloomers always “catch up” and end up just as tall. The reality is more nuanced. Constitutional delay of growth and puberty, the medical term for the late-bloomer pattern, is a normal variation. Boys with this pattern do eventually go through puberty in the normal sequence and typically reach a normal adult height.⁸ But “normal” doesn’t always mean “as tall as their genetics predicted.” One study found that 58 percent of boys with constitutional delay failed to reach their full genetic height potential, and the shortfall appeared to come mainly from less spinal growth.⁹

On the flip side, boys who enter puberty early don’t necessarily end up taller. Early puberty means higher estrogen levels sooner, which accelerates growth plate closure. A study of normally maturing children found that an early but otherwise normal pubertal growth spurt had a negative effect on final height, while a delayed one had a positive effect.¹⁰ A longitudinal study of Chinese children confirmed this pattern: boys with early timing, less intense growth spurts, or shorter duration of growth ended up shorter in late adolescence compared to those with later, longer, or more intense spurts.¹¹

There’s an interesting wrinkle here. Boys who start puberty later tend to have a smaller total pubertal height gain and a shorter growth period, even though they ultimately grow for longer overall.¹² The extra pre-pubertal growth years help compensate, but they don’t always make up for a less vigorous spurt. So the honest answer is that both early and late puberty come with trade-offs, and neither guarantees being taller or shorter than average.

How to Estimate Your Adult Height

The most common method people encounter is the mid-parental height formula, often called the Tanner formula. You add both parents’ heights together, add about 13 cm for a boy (or subtract 13 cm for a girl), and divide by two. It gives you a rough genetic target. But “rough” is doing a lot of work in that sentence. Standard mid-parental height calculations explain only about 36 percent of the variation in children’s heights.¹³ That means the majority of what determines your height is not captured by simply averaging your parents.

The Tanner formula also has known biases. It tends to underestimate adult height in children of very short parents, and multiple studies in different populations have found that actual adult heights exceed Tanner-based predictions, sometimes by a meaningful margin.¹⁴ A Korean study found that actual adult heights ran consistently above Tanner predictions, and that the real influence of parental height was lower than the formula assumed.¹⁵ More refined formulas that account for factors like the parents’ ages and regression toward the mean can improve prediction, but even those still leave a lot unexplained.

For a more precise estimate, doctors use bone age X-rays of the left hand and wrist. The degree of maturity visible in the bones gives a better picture of how much growth potential remains than calendar age alone. Newer automated systems using deep learning can assess bone age and predict adult height with impressive accuracy, achieving errors of only about 1.75 cm for height prediction on average.¹⁶ If you genuinely want to know how much growth you have left, a bone age assessment from your pediatrician is far more informative than any online calculator.

Sleep, Nutrition, and Exercise

You can’t hack your way to being taller than your genetics allow, but you can make sure you don’t fall short of your potential. The three biggest lifestyle factors are sleep, nutrition, and physical activity, and they matter most during the pubertal growth window.

Growth hormone is released in large pulses during deep sleep, particularly during the first bout of slow-wave sleep shortly after falling asleep.¹⁷ Chronically short or disrupted sleep during puberty can blunt that release. This doesn’t mean sleeping 12 hours will make you taller than sleeping 9. It means consistently getting too little sleep during your growth years can interfere with the normal hormonal signals your body needs to grow.

Nutritional adequacy matters too, though in developed countries, outright deficiency is less common than imbalances. An adequate and balanced diet during the pubertal growth spurt is necessary to support proper growth. Deficiencies in protein, essential amino acids, calories, iron, zinc, and vitamin D can delay the onset or progression of growth and bone development. On the other hand, excessive intake of certain proteins and fats has been linked to earlier puberty, which, as discussed earlier, can reduce final height.¹⁸

As for exercise, there’s a persistent myth that weight training during adolescence stunts growth by damaging growth plates. The evidence doesn’t support this. Supervised resistance training with appropriate form is safe for pre-pubertal and early-pubertal youth and does not negatively affect growth or maturation.¹⁹ Growth plate injuries can occur, but they result from acute trauma or overloading, not from well-designed training programs. You’re far more likely to injure a growth plate playing football than doing supervised squats.

The Height You Measure Depends on When You Measure

If you’ve been tracking your height obsessively (and if you’re reading this article, you might be), here’s something worth knowing: you are measurably taller in the morning than at night. Throughout the day, the discs between your vertebrae compress under the weight of your body. The total loss from morning to midnight averages about 19 mm, or just under two centimeters. More than half of that shrinkage happens within the first hour after waking, and about 80 percent is lost within three hours of getting up.²⁰ When you lie down at night, the discs rehydrate and expand again. This means if you measured yourself at 7 a.m. last week and 9 p.m. this week, you could appear to have “shrunk.” For consistent tracking, always measure at the same time of day.

When Short Stature Gets Medical Attention

Most boys who feel short at 14 are dealing with normal variation, often just late puberty. But sometimes families or pediatricians consider medical intervention. Growth hormone therapy is approved for certain conditions, including growth hormone deficiency, Turner syndrome, and idiopathic short stature (being very short without a clear medical cause). In one trial of prepubertal children with idiopathic short stature, 26 weeks of growth hormone treatment increased growth speed by about 6.4 cm per year, and height improved without excessive acceleration of bone maturation.²¹ However, GH therapy is expensive, requires daily injections, and the gain in final adult height for children who are simply short but otherwise healthy tends to be modest, typically a few centimeters over years of treatment. It’s not a casual decision, and most endocrinologists recommend it only when a child’s height is significantly below the normal range.

Why Boys Your Age Are Taller Than Boys a Century Ago

If it’s any comfort, 14-year-old boys today are substantially taller than their counterparts from previous generations. Over the past century, improvements in nutrition, sanitation, and healthcare have driven a steady upward trend in adolescent height. Portuguese boys, for example, gained an average of 19.1 cm at age 14 over the span of a century, and the age of peak growth velocity moved earlier by about two years.²² Similar patterns have appeared across Europe, Asia, and the Americas.

There are signs this trend is leveling off in some populations, though. A study of boys in Krakow, Poland, found that while mean height at most ages was greater than in the past, the final adult height had stabilized at about 179 cm over the most recent decade. At the same time, weight and BMI continued to increase, and puberty was arriving earlier. The researchers described this as a “progressing developmental disharmony,” a situation where boys are maturing faster but not growing taller.²³ This mirrors what’s happening in many high-income countries: once a population has access to adequate nutrition and healthcare, most of the genetic height potential is realized and the secular trend plateaus.

The Psychological Side of Growing

Height anxiety among teenage boys is common and worth acknowledging rather than dismissing. A study of adolescent boys found that about a third reported moderate to high dissatisfaction with their height, which is a real but often overlooked concern compared to the more frequently studied topics of muscle and weight dissatisfaction.²⁴ The same study found that muscle dissatisfaction was even more prevalent, with nearly 80 percent of boys reporting intermediate to severe concern about their muscularity. These concerns are developmentally normal to a point, but they can become consuming during the years when peers are developing at wildly different rates.

If you’re 14 and feel like everyone else shot up while you didn’t, remember that boys’ pubertal growth spans a wide age range. Some have nearly finished by 15; others don’t hit their fastest growth until 15 or later. The classmate who towers over you now may have peaked, while you may have years of growth ahead. Measuring yourself weekly won’t speed anything up, and comparing yourself to friends whose bodies are on a different developmental clock only fuels frustration. If your growth seems genuinely stalled or you haven’t shown any signs of puberty by 14, that’s worth a conversation with a doctor, not because something is necessarily wrong, but because a bone age X-ray or blood work can either reassure you or identify a treatable issue early.